Book excerpt: The hormonal problems that are prevalent among women of all ages have many causes, including family and occupational stress, dietary habits, and our chemical environment. These problems are particularly amenable to herbal and nutritional treatment, but they are also multifactorial and sometimes subtle. The interplay of hormonal receptors and natural products is becoming ever better known, as is the role of these receptors in conditions as diverse as breast cancer and polycystic ovary syndrome, or PCOS. It is not always easy to make sense of this information, however, and its sheer abundance can be quite overwhelming. The purpose of this book is to give a concise overview of the principles of treatment for hormonal conditions in women that are of direct practical benefit in practice. Geared toward prospective, new, and experienced herbal practitioners, it aims to provide a clear working knowledge of the hormonal basis of gynaecological problems to help herbalists form practical, straightforward treatment plans that can be easily documented and explained to patients. Having a clear, therapeutic rationale motivates patients to participate fully in their treatment, understand what is happening as it progresses, and remain in treatment long enough to see its full benefit.